mutation in the triggers table problem (need to COUNT (col) and MAX (col) of table shot)

I was looking for the solution and find many examples, but I do not know what is the best in my option and don't understand everything.

I realized that can't do a SELECT query in the table where trigger is triggered. But I have need SELECT COUNT (col), then MAX (id) of this table, update some statistical info...
And also need to row id update, so I can't do trigger of table instead of relaxation of the line.

So this is my TRIGGER:

create or replace

update_stat relaxation

AFTER UPDATE ON TABLE1 TO EACH LINE

DECLARE

juice FLOAT;

all the NUMBER;

end NUMBER;

BEGIN

IF (: old.ended <>: new.ended) THEN

SELECT COUNT (id) FROM end FROM table1 WHERE fk_table2 = new.fk_table2 AND finished = 1; -Error in the table of mutation

SELECT COUNT (id) FROM everything FROM table1 WHERE fk_table2 = new.fk_table2; -Error in the table of mutation

Juice: = ((end /all) * 100);

UPDATE table2 SET suc = success WHERE id =:new.fk_table2;

END IF;

END;

I also tried with

pragma autonomous_transaction; 
 
trigger body....AND
 
 
commit;

But don't working right when insert more records.

Thanks, Urban

Data and structure of the example table

SQL> create table table2
  2  (
  3     id        integer
  4   , success   number
  5   , constraint table2_pk primary key (id)
  6  );

Table created.

SQL> create table table1
  2  (
  3     id        integer
  4   , id_t2     integer
  5   , ended     integer
  6   , constraint table1_pk primary key (id)
  7   , constraint table1_fk_id_t2 foreign key (id_t2) references table2
  8  );

Table created.

SQL> insert into table2(id, success) values (1, 0);

1 row created.

SQL> insert into table2(id, success) values (2, 0);

1 row created.

SQL> insert into table1
  2  (
  3     id
  4   , id_t2
  5   , ended
  6  )
  7  select level
  8       , ceil(level/10)
  9       , 0
 10    from dual
 11  connect by level <= 20;
20 rows created.

SQL> commit;

Commit complete.

Create objects to the suite

create or replace type update_stat_obj as object (id integer, id_t2 integer, ended integer)
/
create or replace type update_stat_tbl as table of update_stat_obj
/
create or replace package update_stat_pkg
as
   g_table_1 update_stat_tbl;
   procedure load(p_id integer, p_id_t2 integer, p_ended integer);
   procedure updt;
end;
/
show err
create or replace package body update_stat_pkg
as
   procedure load(p_id integer, p_id_t2 integer, p_ended integer)
   is
   begin
      if g_table_1 is null then
        g_table_1 := update_stat_tbl();
      end if;

      g_table_1.extend;
      g_table_1(g_table_1.count) := update_stat_obj(p_id, p_id_t2, p_ended);
   end;
   procedure updt
   is
   begin
       merge into table2 t2
       using (
              select t1.id_t2
                   , (count(t2.id)/count(t1.id))*100 success
                from table1 t1
                left
                join table(g_table_1) t2
                  on t1.id    = t2.id
                 and t2.ended = 1
               group
                  by t1.id_t2
             ) t1
          on (t2.id = t1.id_t2)
        when matched then
            update set t2.success = t1.success;

       g_table_1 := null;
   end;
end;
/
show err
create or replace trigger update_stat_row_trig after update on table1 for each row
begin
    if (:old.ended <> :new.ended)
    then
       update_stat_pkg.load(:new.id, :new.id_t2, :new.ended);
    end if;
end;
/
show err
create or replace trigger update_stat_trig after update on table1
begin
    update_stat_pkg.updt;
end;
/
show err

Now look for the UPDATE.

SQL> select * from table1;

        ID      ID_T2      ENDED
---------- ---------- ----------
         1          1          0
         2          1          0
         3          1          0
         4          1          0
         5          1          0
         6          1          0
         7          1          0
         8          1          0
         9          1          0
        10          1          0
        11          2          0
        12          2          0
        13          2          0
        14          2          0
        15          2          0
        16          2          0
        17          2          0
        18          2          0
        19          2          0
        20          2          0

20 rows selected.

SQL> select * from table2;

        ID    SUCCESS
---------- ----------
         1          0
         2          0

SQL> update table1 set ended = 1 where id between 1 and 7 or id between 11 and 19;

16 rows updated.

SQL> select * from table2;

        ID    SUCCESS
---------- ----------
         1         70
         2         90

SQL> select * from table1;

        ID      ID_T2      ENDED
---------- ---------- ----------
         1          1          1
         2          1          1
         3          1          1
         4          1          1
         5          1          1
         6          1          1
         7          1          1
         8          1          0
         9          1          0
        10          1          0
        11          2          1
        12          2          1
        13          2          1
        14          2          1
        15          2          1
        16          2          1
        17          2          1
        18          2          1
        19          2          1
        20          2          0

20 rows selected.

Tags: Database

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